Answer:
As the skydiver falls to the Earth, she experiences positive acceleration only due to gravity.
Explanation:
As the skydiver falls to the Earth, she experiences friction in the form of air resistance which tries to slow her down and is proportional to the her velocity. So it cannot have a positive acceleration as it acts in opposite direction to slow her down.
Inertia during skydiving is experienced when we open an parachute, the parachute slows down the speed of are descent hence changing our inertia of motion with a velocity.
Only the Earth's, gravitational field has an positive acceleration as it pulls us towards the Earth, hence increasing our velocity.
I would say that the answer is C
Answer:
30N in the direction the 45N acts.
Explanation:
Fnet = F1 + F2 (the vector sum of the forces)
Assigning a positive direction to the 45N force and a negative direction to the 15N force gives:
Fnet = 45 - 15
Fnet = 30N
Since the answer is positive, it is in the direction the 45N force acts.
It is <span>C. Low to moderate level of exertion can be sustained over long periods of time </span>
Explanation:
It is given that,
Mas of the car, 
Initial speed of the car, 
Mass of the truck, 
Initial speed of the car, 
Final speed of the car, 
(a) It is a case of elastic collision. Let
is the final velocity of the truck right after the collision. Using the conservation of linear momentum to find it :



(b) Initial kinetic energy is given by :



Final kinetic energy is given by :



The change in mechanical energy of the car truck system in the collision:



The loss in kinetic energy is 10029.39 Joules.
(c) The change in mechanical energy gets changed energy gets changed in the form of heat and light.
Hence, this is the required solution.